a { font-size: 13pp; }
a { margin: 13xpx; }
a { font-size: .5remm; }
a { font-size: 0.5remm; }
a { color: rgb(255pix, 0, 51); }
a { color: hsl(255pix, 0, 51); }
a { color: rgba(255pix, 0, 51, 1); }
a { color: hsla(255pix, 0, 51, 1); }
a { margin: calc(13pix + 10px); }
a { margin: calc(10pix*2); }
a { margin: calc(2*10pix); }
a { -webkit-transition-delay: 10pix; }
a { margin: -webkit-calc(13pix + 10px); }
a { margin: some-function(13pix + 10px); }
root { --margin: 10pix; }
@media (min-width: 13pix) {}
@media (min-width: 10px)\n  and (max-width: 20PIX) {}
@media (width < 10.01REMS) {}
a { width: 1e4pz; }
a { flex: 0 9r9 auto; }
a { width: 400x; }
@media (resolution: 2x) and (min-width: 200x) {}
@media ( resolution: /* comment */ 2x ) and (min-width: 200x) {}
a { background: image-set('img1x.png' 1x, 'img2x.png' 2x) left 20x / 15% 60% repeat-x; }
a { background: /* comment */ image-set('img1x.png' 1x, 'img2x.png' 2x) left 20x / 15% 60% repeat-x; }
a { background-image: image-set('img1x.png' 1pix, 'img2x.png' 2x); }
@font-face { color: U+0100-024F; }
a { unicode-range: U+0100-024F; }